package com.hmdp.utils;

import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    //时间戳id生成器
    private static final long BEGIN_TIMESTAMP=1640995200L;
    @Resource
    private RedisTemplate redisTemplate;
    public long nextId(String keyPrefix){
        //生成时间戳
        LocalDateTime now=LocalDateTime.now();
        long nowSecond=now.toEpochSecond(ZoneOffset.UTC);
        long timestamp=nowSecond-BEGIN_TIMESTAMP;
        //生成序列号
        String date=now.format(DateTimeFormatter.ofPattern("yyyyMMdd"));
        Long count = redisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        return timestamp<<32 | count;
        //拼接并返回

    }


}
